docs: add release notes for v5.8.8

Author: github-actions[bot]

release_notes/v5.8.8.md

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+## [5.8.8](https://github.com/NHSDigital/eps-common-workflows/compare/v5.8.7...v5.8.8) (2026-03-26)
+
+
+### Upgrade
+
+* [dependabot] - bump picomatch from 2.3.1 to 2.3.2 (#108) ([9705940](https://github.com/NHSDigital/eps-common-workflows/commit/97059401fbec4c0914532277dfe8ce95dd3213fd))
+
+## Info
+[Release workflow run](https://github.com/NHSDigital/eps-common-workflows/actions/runs/23602683628) - Workflow ID: 23602683628
+
+It was initialized by [eps-autoapprove-dependabot[bot]](https://github.com/apps/eps-autoapprove-dependabot)
+
+